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Benefit Plans Stock-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total compensation expense $ 622,000 $ 440,000 $ 384,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Description The Plan authorized the grant of stock options amounting to 2,285,280 shares to Company directors, advisory directors, officers, and employees. Option awards are granted with an exercise price equal to the market price of First Financial Northwest’s common stock at the grant date.    
Share-based Compensation Arrangement by Share-based Payment These option awards have a vesting period of five years, with 20% vesting on the anniversary date of each grant date, and a contractual life of ten years. Any unexercised stock options will expire ten years after the grant date, or sooner in the event of the award recipient’s death, disability or termination of service with the Company.    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Description The Plan authorized the grant of restricted stock awards amounting to 914,112 shares to directors, advisory directors, officers and employees. Compensation expense is recognized over the vesting period of the awards based on the fair value of the stock at the grant date. The restricted stock awards’ fair value is equal to the value on the grant date. Shares awarded as restricted stock vest ratably over a five-year period beginning at the grant date with 20% vesting on the anniversary date of each grant date.    
First Financial Northwest, Inc. 2008 Equity Incentive Plan      
Compensation expense, related tax benefit $ 218,000 154,000 $ 134,000
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Stock Options      
Award vesting period 5 years    
Percentage vesting per annum 20.00%    
Contractual life 10 years    
Number of shares remaining for grant 611,756    
Unrecognized compensation cost $ 590,000    
Unrecognized compensation cost recognition period 2 years 9 months    
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock      
Award vesting period 5 years    
Percentage vesting per annum 20.00%    
Number of shares remaining for grant 74,478    
Unrecognized compensation cost $ 177,000    
Unrecognized compensation cost recognition period 1 year 1 month    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 367,000 $ 212,000  
First Financial Northwest Inc 2016 Equity Incentive Plan [Member] | Stock Options      
Stock options granted (shares) 1,400,000    
Number of shares remaining for grant 1,371,896    
First Financial Northwest Inc 2016 Equity Incentive Plan [Member] | Restricted Stock      
Stock options granted (shares) 400,000    
Number of shares remaining for grant 385,948